Device for imparting combined rotary and reciprocating motion.



PATENTE D JUNE 21, 1904.

- J. THOMSON. DEVICE FOR IMPARTING COMBINED ROTARY AND RBOIPROOATINGMOTION.

APPLICATION FILED OUT. 23. 1902.

I0 MODEL.

an uanl'oz 1 31 human lrrom UNITED STATES Patented June 21, 1904.

PATENT OFFICE.

JOHN THOMSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO JOHN THOM- SON PRESSCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

DEVICE FOR IMPARTING COMBINED ROTARY AND RECIPROCATING MOTION.

SPECIFICATION forming part of Letters Patent No. 762,958, dated J 11121, 1904. Application filed October 23,1902. Serial No. 128,469. (Nomodeli To all 1072/0777, 7123 777,04 concern.-

Be it known that 1, JOHN THOMsON, a citizen of the United States,residing at Brooklyn, in

the county of Kings and State of New York,

ciprocating motion illustrated in my patent.

of February 21, 1888, No. 378,344; and the object hereof is to rendereffective a modification referred to in this patent.

Having reference to the aforesaid patent, the statement is therein madethat two epicyclic gears may be used instead of one; but it was not thencomprehended that thiscould not be realized in practice by a mereduplication of structure. As a matter of fact, I have but recentlyascertained that to accomplish the use of a pair of epicyclic gears forcooperatively effecting the reciprocating action requires quite adifferent construction. This is the subject of the present application.

In the drawings, Figure 1 is a detail in longitudinal center sectionand. elevation denoting an embodiment of the invention. 2 is an endview; and Fig. 3 is a transverse section on the line B of Fig. 1, inwhich the gears are revolved half of a turn.

The operation of this device will be briefly described in so far asrelates to the present improvement, The object sought is to cause thecylinder 7 to revolve with. the shaft 21 and also to slide back andforth thereon. Its principal application in practice is in connectionwith platen printing-presses, where such devices are usually termedchangers? being used for distributing the ink upon the forminking andthe distributer rollers. Assuming that the present drawings had but oneepicyc lic gear, as 12, the device would then be a duplication of thatillustrated and described in the aforesaid patent, No. 378,344. Theshaft-fixture 16 is secured, as by the set bolt 23, to the shaft 21, andupon the stud 14 is mounted the gear 12, free to revolve thereon.

Upon the upper side of the gear 12 is a crankstud 19, whose throw oreccentricity is denoted by the lines 27 29. The gear 12meshes with thegear 24, which is made fast to the frame 25 of the machine and. is:prevented from rotating, as by the bolt or bolts 26. The crank-studfreely engages a slot 5, formed within the cylinder. Now upon impartingrevolution to the cylinder and also to the shaft this will cause theepicyclie gear 12 both to rotate, around the gear 24'and also to revolveupon its stud or bearing 14. Consequently the crank-stud willreciprocate the cylinder upon the shaft back and forth for each fullrevolution of the gear 12. As bearing upon the present matter, thefollowing extract is quoted from the specification of the aforesaidpatent, No. 378,344: When severe duty is required, another stud may beformed and an additional .gear may be mounted thereon the duplicate ofgear 25, the cylinder also having another slot diametrically oppositefrom that shown in the drawings. In other words, the cylinder would thenbe reciprocated by a pair of gears, and so arranged the action would bein its theoretically most perfect form.

To assemble the single epicyclic gear with- 7 5 in the cylinder as shownin Patent No. 378,344, I it is first inserted into the cylinder out ofits center and then carried outwardly until its actuating-stud engagesthe slot, after which the shaft is inserted, thus securing the parts inplace. Obviously this cannot be done when two gears are used eachmounted oppositely from the other, nor can they'be revolved into placewithout such an excess of room and sacrifice of mechanical effectivenessas would not be permissible in the class of structures to which thedevice is chiefly applicable namely, the inking-cylinders of platenprinting-presses. To obviate this difficulty, I form the slots 5 5 withtheir inner walls'6 6 as a part of the cylinder 7; but the outer walls 89 are made from separate pieces inserted in and detachably secured tothe inner perimeter 10 of the cylinder, as by means of the screws orstuds 11. In this wise the epicyclic gears 12 13 are mounted upon thestuds 14 15 of the k shaft-fixture 16, and the friction blocks orrollers 17 18 are applied to the crank-studs 19 20, and all as aself-contained structure is concentrically inserted, after which theouter wallpieces 8 9 are secured to their seats. Finally, thedriving-shaft 21 is slid through the hearing 22 of the fixture, securedthereto as by the set-bolt 23, and the fixed or driving gear 24 isapplied over the end of the shaft to engage the epicyclic gears, beingsecured to the frame of the machine, as 25, by the bolt or bolts 26.

In constructing and assembling this device it is essential to observethat the centers of the crank-studs, as 27 28, are respectively to theright and left of the center, as 29, of the shaftlixture, also that bothcrank-studs must lie in the same line with respect to the teeth of thegears and that when an uneven number of teeth are employed in theepicyclic gears say as thirty-fivethen an even number of teeth must bein the fixed driver-say as ten.

'epicyclic gears, the crank-studs, the shaftlixture and the shaft, of acylinder having the outer walls of the slots which engage thecrank-studs detachably secured to the said cylinder, substantially asand for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

JOHN THOMSON.

v \Vitnesses:

L. S. FoLeER, F. L. HARRISON.

